I believe the EIST and C1E settings are most relevant to the changing Proc speed during different types of load..
Disabling them would mean the CPU will always run at set clock speed. Which for that Proc is 8 X 266.25, I think.
Thats only part of the guide.
I suggest you follow it from start to finish.

You can lower the multi on most procs but not increase it.
Which may be useful if certain speeds/settings aren't stable..
Instead of 9 x 400 for a 3.6 GHz clock you could do 8 X 450, or even 6 X 600, for some examples..